String processing in Python(as a list) -

-

i need advice. need write program in python requests user string s consisting of left , right brackets, instance (()))(()(.

after this, program needs count number of left , number of right brackets of input string. example, string (()))(() contains 4 right brackets , 4 left brackets. hint: introduce 2 counters initialized 0 in beginning. explore symbols of string in loop. current symbol increment left counter 1 f symbol (, otherwise, increment 1 right counter.

then, need test whether string math-like.

let call string math-like if brackets occur in mathematical formula. instance, strings (), (())(), (()()) math-like, while strings ))(())(( , ())(() not. need write program prints "yes" if input string math-like , "no" otherwise. hint: in particular, each iteration of loop, need check values of left , right counters satisfy particular condition.

i beginner, confusing me write implementation of task or @ least imagine how should look.

i appreciate type of help, because need solve problem. thank in advance!

sounds me you're looking answer course exercise you. main point of such thing you work out. here's starter, rather "here, give teacher."

token parsing requires more; paying attention order of parenthesis. here's how run through string , @ have:

test1 = '(()))(()(' test2 = '(()))(()'  def ptest(test):     lefts = 0     rights = 0     balance = 0     c in test:         if c == '(':             balance += 1             lefts += 1         elif c == ')':             balance -= 1             rights += 1     print 'testing "'+test+'"'     print 'lefts='+str(lefts)+' rights='+str(rights)     if balance == 0: print 'balanced, possibly math-like'     else: print 'unbalanced, not math-like'  ptest(test1) ptest(test2)

Comments

Post a Comment

Popular posts from this blog

php - How to display all orders for a single product showing the most recent first? Woocommerce -

-
i have password protected page on frontend. on page, want display full list of purchases associated single woocommerce product id. option 1: i've looked through woocommerce docs , , found: wc_cli_order , list_( $args, $assoc_args ) function lists orders. presumably, orders can filtered product id [--=] filter orders based on order property. line item fields (numeric array, started index zero): line_items.0.product_id option 2: i found article , based on customer id. i've modified code based on guesses meta_key , meta_value. $customer_orders = get_posts( array( 'numberposts' => -1, 'meta_key' => '_product', 'meta_value' => get_product_id(), 'post_type' => wc_get_order_types(), 'post_status' => array_keys( wc_get_order_statuses() ), ) ); how display orders single product showing recent order first? here solution put based on these articles: http://www.w...
Read more

asp.net - How to correctly use QUERY_STRING in ISAPI rewrite? -

-
i'm having difficult time , hope guys can help. using helicon isapi rewrite version 3.1.0.104 on our iis server. edit http.conf file , have tried , still fail. this trying do: redirect url: https://www.domain.com/switch-by-version?version=2.8.5.2594 to: https://test.domain.com/load/load.aspx?tver=2.8.5.2594 the version number @ end source url change, , need target url have same version number @ end of url example above shows. i tried following not work: rewritecond %{query_string} ^version=(\d\d?)\.(\d\d?)\.(\d\d?)\.(.*)$ [nc] rewriterule ^/switch-by-version(.*)$ https://test.domain.com/load/load.aspx?tver=%1 [r=307,nc,l] any appreciated! thanks. if it's running in equivalent context of .htaccess , rule shouldn't start / . here's simpler version: rewritecond %{query_string} ^version=(\d+\.\d+\.\d+(?:\..+)?)$ [nc] rewriterule ^switch-by-version/?$ https://test.domain.com/load/load.aspx?tver=%1 [r=307,nc,l]
Read more

angularjs - How restrict admin panel using in backend laravel and admin panel on angular? -

-
https://scotch.io/tutorials/token-based-authentication-for-angularjs-and-laravel-apps following tutorials, try write authentication restrict admin panel, didn't understood how can that. this admin panel, admin panel don't want show , request database unauthenticated users. my laravel-routes route::get('/admin',function(){ return view('index'); }); route::get('/api/v1/employees/{id?}', 'employees@index'); route::get('/api/v1/users/{id?}', 'employees@users'); route::post('/api/v1/employees', 'employees@store'); route::post('/api/v1/employees/{id}', 'employees@update'); route::delete('/api/v1/employees/{id}', 'employees@destroy'); route::group(['prefix' => 'api'], function() { route::resource('authenticate', 'authenticatecontroller', ['only' => ['index']]); route::post('authenticate', 'authentic...
Read more